“A little can go a long way in Haiti,” David Zwirner said to a flock of press gathered at his gallery on Tuesday for a walkthrough of “Artists for Haiti,” the special sale of artworks that he organized for a benefit auction at Christie’s in New York on the evening of Sept. 22, 2011. Conceived in collaboration with actor (and art collector) Ben Stiller and his eponymous philanthropic foundation to bolster relief efforts in the earthquake-ravaged Caribbean country -- the poorest in the Western Hemisphere -- the sale brings together 26 paintings, drawings and sculptures, most of which were made specifically for the auction and donated by 25 international artists, ranging from Neo Rauch and Karin Mamma Anderssonto Glenn Ligon and Urs Fischer.